G. S. Graham-Smitii 
481 
Hydrotaea dentines Fab. 
A very common, dark brown fly, about tbe size of the house-fly, 
M. domestica, and' probably often mistaken for that species. The male 
is much darker than the female. 
Length. 8 mm.; span of wings 16 mm. 
Head. In the male eyes close together, separated by 0-2 mm.; in female separated 
by 1 mm.; frontal stripe black and frontal margins of eyes white; antennae 
black. Arista bare. 
Thorax. In male almost uniform dark brown; in female brown with dark stripes, 
ill-defined except near the head. 
Wings. Smoky in male, clear in female. The fourth longitudinal vein runs straight 
out to the margin of the wing. Squama white. 
Legs. Dark. The front femur of the male bears a tooth-like downward projecting 
spur, and a tubercle on its under surface about 0-3 mm. from its distal end. 
Abdomen. Dark brown with irregular darker markings. 
Ophyra leucostoma Wied. 
A medium-sized, blue-black fly. The male is usually distinctly 
larger than the female. 
Length. 7 mm.; span of wings 15 mm. 
Head. The head of the male is very large and the eyes very close together. The 
head of the female is smaller and the eyes separated by 0-75 mm. Frontal 
region black. Antennae black. Arista bare. 
Thorax. Shining blue-black without markings. 
Wings. Clear with fourth longitudinal vein passing straight out to the margin of 
the wing. Squama almost transparent. 
Legs. Black. 
Abdomen. Shining blue-black. 
Plate XXVII. Photographs of living specimens (nat. size) of common species of flies. 
Except in figs. 6, 7, 19 and 20 both sexes are shown, the male on the left and the 
female on the right. The left wing is illustrated also to show the venation. 
Fig. 
1 . 
Phormia groenlandica Ztt. 
Fig. 
12. 
Musca domestica L. 
99 
2. 
Callipkora erythrocephala Mg. 
99 
13. 
Sarcophaga camaria L. 
99 
3. 
CaUiphora vomitoria L. 
99 
14. 
Mydaea lucorum Fin. 
,, 
4. 
Lucilia sericata Mg. 
,, 
15. 
Polietes lardaria Fab. 
99 
5. 
Pseudopyrellia eomicina Fab. 
99 
16. 
Hydrotaea dentipes Fab 
99 
6. 
Pyrellia eriophthalma Macq. ($). 
99 
17. 
Ophyra leucostoma Wied. 
99 
7. 
Graphomyia maculata Scop. ($). 
99 
18. 
Fannia canicularis L. 
99 
8. 
Pollenia rudis Fab. 
99 
19. 
Scatophaga suilla Fab. (d). 
99 
9. 
Muscina stabulans Fin. 
99 
20. 
Dryomyza flaveola Fab. ($), 
99 
10. 
Muscina pabulorum Fin. 
99 
21. 
Eristalis tenax L. 
99 
11. 
Stomoxys calcitrans L. 
